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    • 5. 发明授权
    • Unbalanced antenna system
    • 不平衡天线系统
    • US5914696A
    • 1999-06-22
    • US927761
    • 1997-09-11
    • Ronald J. VanderhelmLarry J. Zibrik
    • Ronald J. VanderhelmLarry J. Zibrik
    • H01Q1/22H01Q9/38H01Q1/48
    • H01Q1/2275H01Q1/22H01Q9/38
    • An antenna system (20) provides low radio frequency interference (RFI) using an unbalanced antenna (21) comprised of three eighths wavelength whip antenna element (22) and associated counterpoise (23). Antenna counterpoise (23) may be formed by an EMI shielding conductor which is isolated at the frequency of operation of antenna system (20) from EMI shielding serving as host interface ground conductor (28) using resonant structure (25). Resonant structure (25) isolates antenna counterpoise (23) from host interface ground conductor (28) thereby improving antenna efficiency, and substantially eliminating RFI effects arising from use of antenna system (20).
    • 天线系统(20)使用由三分之一八分之一波长鞭状天线元件(22)和相关联的平衡(23)构成的不平衡天线(21)来提供低射频干扰(RFI)。 天线平衡(23)可以由EMI屏蔽导体形成,其EMI天线系统(20)的工作频率与使用谐振结构(25)作为主机接口导体(28)的EMI屏蔽隔离。 共振结构(25)将天线平衡(23)与主机接口接地导体(28)隔离,从而提高天线效率,并且基本上消除了使用天线系统(20)引起的RFI效应。